MESON Chess Problem Database

Problem Display
PID: 161678 (8/8/8/6R1/4KN2/8/2Qp1p2/4k3 w - - 0 1)

Andreev, Aleksandr Grigorevich

Kuban segodniya, 1996

8/8/8/6R1/4KN2/8/2Qp1p2/4k3

#2

4 + 3

15148 Sadier Collection 2017

SOLUTION

  • SOUND
  • Sets
    • 1...Kf1
      • 2.Qd1#
    • 1...d1S
      • 2.Qe2#
    • 1...d1R
      • 2.Qe2#
  • Tries
    • 1.Sg2+?
      • 1...Kf1
        • 2.Qd1#
      • 1...Ke2!
    • 1.Sd3+?
      • 1...Kf1
        • 2.Qd1#
      • 1...Ke2!
    • 1.Rd5?
      • 1...Kf1
        • 2.Qd1#
      • 1...d1Q
        • 2.Rxd1#
        • 2.Qxd1#
      • 1...d1S
        • 2.Rxd1#
        • 2.Qxd1#
        • 2.Qe2#
      • 1...d1B
        • 2.Rxd1#
        • 2.Qxd1#
      • 1...d1R
        • 2.Rxd1#
        • 2.Qxd1#
        • 2.Qe2#
      • 1...f1Q
        • 2.Qxd2#
      • 1...f1B
        • 2.Qxd2#
      • 1...f1R
        • 2.Qxd2#
      • 1...f1S!
    • 1.Qxd2+?
      • 1...Kf1
        • 2.Qc1#
        • 2.Qd1#
        • 2.Qe2#
      • 1...Kxd2!
  • Keys
    • 1.Rg2!
      • 1...Kf1
        • 2.Qd1#
      • 1...d1Q
        • 2.Qxf2#
      • 1...d1S
        • 2.Qe2#
      • 1...d1B
        • 2.Qxf2#
      • 1...d1R
        • 2.Qe2#
        • 2.Qxf2#
      • 1...f1Q
        • 2.Qxd2#
      • 1...f1S
        • 2.Sd3#
        • 2.Re2#
      • 1...f1B
        • 2.Qxd2#
      • 1...f1R
        • 2.Sd3#
        • 2.Re2#
        • 2.Qxd2#

FEATURES

  • Static
    • TYPE = INCOMPLETE_BLOCK
    • CHANGED MATES = 0
    • ADDED MATES = 4
    • REMOVED MATES = 1
  • Sets
    • K(a);P-FLIGHT::QAR2(A)
    • P(b);OGATE::QAR1(A)
  • Tries
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • S(C);CHECK
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
      • Refutation
        • K(a);P-FLIGHT,P_SPINP(b)
    • Try
      • R(D);
      • Vars
        • K(a);P-FLIGHT::QAR2(A)
        • P(c);SBLOCK::QAB1(A),XP(b)
      • Refutation
        • P(c);
    • Try
      • Q(A);CHECK,XP(b)
      • Refutation
        • K(a);S_FLIGHT,XQ(A)
  • Actual
    • R(D);
    • Vars
      • K(a);P-FLIGHT::QAR2(A)
      • P(b);OGATE,SBLOCK::QAB1(A),XP(c)
      • P(b);OGATE::QAR1(A)
      • P(c);SBLOCK::QAB1(A),XP(b)
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